# 关于时间类的理解
# 1.datatime类 date类
from datetime import datetime
import time
t = time.localtime()
date_day_str = "%d-%02d-%02d" % (t.tm_year, t.tm_mon, t.tm_mday)
print(date_day_str)

for i in range(0,30):
    print(i)